高电压阴极材料LiCoVO_4的合成与结构表征  

Synthesis and structure characterization of LiCoVO_4 as new high-voltage cathode material

作　　者：麦立强[1] 陈文[1] 徐庆[1] 朱泉峣[1] 杨慧鹏[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《电源技术》2003年第5期435-437,共3页Chinese Journal of Power Sources

基　　金：国家自然科学基金项目(59802009;50172036);第三届高等学校优秀青年教师教学科研奖励计划资助项目(无编号)

摘　　要：通过改进的ChimieDouce法制备出高电压阴极材料LiCoVO4,并采用XRD、红外吸收光谱(FTIR)和拉曼散射光谱(Raman)等对其结构进行表征。结果表明在450℃低温下的产物为高结晶的单相LiCoVO4,其中锂和钴占据八面体空隙,而钒原子占据四面体空隙位置。LiCoVO4位于820cm-1处的红外吸收带和拉曼吸收带分别归属于VO4四面体,具有A1对称的伸缩振动和VO4四面体中V—O键振动的内模振动峰,而335cm-1处的红外和拉曼吸收带则对应于VO4四面体具有E对称的变角振动。A modified Chimie Douce method was introduced for preparing inverse spinel LiCoVO_4 as novel high-voltage cathode material for Li-ion batteries and its structure was characterized by XRD, IR and Raman techniques. The results of XRD show that the high crystalline LiCoVO_4 with high phase purity are formed at 450 ℃, in which both lithium and cobalt occupy the octahedral interstitial positions and vanadium occupies the tetrahedral interstitial positions. Results of the IR and Raman investigations show that the band located at 820 cm-1 corresponds to the stretching vibration mode with the A_1 symmetry, whereas the band situated at 335 cm-1 corresponds to the bending mode of the VO_4 tetrahedron with E symmetry.

关 键 词：锂离子蓄电池 高电压阴极材料 LiCoVO4 合成 结构表征 反尖晶石结构 

分 类 号：TM912.2[电气工程—电力电子与电力传动]